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Leptolalax is a genus of frogs (order Anura) in the family Megophryidae. They are sometimes known as Asian toads, although many species-specific common names do not follow this convention, and many species do not have common names. They are widely distributed in southeastern and eastern Asia, from southern China and northeastern India to the Malay Peninsula and Borneo.[1] Leptolalax are typically small and have a cryptic colour pattern and no obvious morphological characters useful in systematic studies. Consequently, both molecular genetic analyses and analysis of advertisement calls by male frogs have been important in identifying new species.[2][3][4]

Two subgenera are recognized: Leptolalax and Lalos (the latter was first named as Lalax, but the name was already occupied). Lalos has a more northern distribution and only includes species from the continental Asia, whereas Leptolalax includes all the species from Borneo (Leptolalax arayai, Leptolalax dringi, Leptolalax fritinniens,[4] Leptolalax gracilis, Leptolalax hamidi, Leptolalax maurus, and Leptolalax pictus) as well as few continental species (Leptolalax croceus, Leptolalax melicus) and Leptolalax kajangensis from Tioman Island, at least provisionally.[1]

Most Leptolalax species have been reported from very small areas and a few species have large areas of occurrence. Whether this distinction is real or the wide-spread species represents cryptic species complexes remains to be confirmed.[3]


There are at least 37 species in the genus. New species are still being described, including two new ones in 2012 and one in 2013:[1][4]


  1. ^ a b c Frost, Darrel R. (2013). "Leptolalax Dubois, 1980". Amphibian Species of the World 5.6, an Online Reference. American Museum of Natural History. Retrieved 5 October 2013. 
  2. ^ Matsui, M. (1997). "Call characteristics of Malaysian Leptolalax with a description of two new species (Anura: Pelobatidae)". Copeia 1997: 158–165. JSTOR 1447851.  edit
  3. ^ a b Ohler, A.; K. C. Wollenberg, P. Grosjean, R. Hendrix, M. Vences, T. Ziegler, A. Dubois (2011). "Sorting out Lalos: description of new species and additional taxonomic data on megophryid frogs from northern Indochina (genus Leptolalax, Megophryidae, Anura)". Zootaxa 3147: 1–83. 
  4. ^ a b c d Dehling, J.M.; Matsui, M. (2013). "A new species of Leptolalax (Anura: Megophryidae) from Gunung Mulu National Park, Sarawak, East Malaysia (Borneo)". Zootaxa 3670 (1): 33–44. 
  5. ^ Rowley, J.J.L., Le, D.T.T, Tran, D.T.A., & Hoang, H.D. (2011). "A new species of Leptolalax (Anura: Megophryidae) from southern Vietnam." Zootaxa 2796: 15-28.


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